Receiver of electrical oscillations.



H. A; WEAGANT.

RECEIVER 0F ELECTRICAL OSCILLATIONS. MPL10/mom men JUNE 18. |914.'

'rastrear .lti.. af.. Jeudi-.fi bei) Ja. at

R03? Jil.. i/VEtG-ANT, 0F MOSELLE PARK, NEW JERSEY, ASSXGNUR T0lrMtRCONI TELEGRAPH COMPANY 0F AMRCA, A CRPRATION 0F lil'EW' JERSEY.

RECEIVER OF ELECTRIIf/illi OSCILLLTIGNS.

Specification of :Letters atent. ligilftrgmlwgtil Hugh, 2565, filthApplication filed June la, 1914;. aerial No. 345,761.

To au 'Lo/"tout t may comlfcrn.'

Bc it known that l, Roi' A. Wnixcan'r, a citizen ot the United States,rcsidino' in ltoselle Park, in the county of Union, ritatc ot 7 and avariable inductance 8, shuntinp,y the detection Any suitable form ofdetector may loe used instead of the crystal detector illustrated NewJersey, have invented certain new and and any suitable indicating,rinstrument may usc'liul Improvements in Receivers of llllecbesubstituted for the telephone 9. trical Oscillations, of which thefollowing is It will thus be seen that the secondary cira description.cuit comprises a circuit containing the scc@ My invention relatesto'apparatus for reondary ot the oscillation transformer 5 andceiving.;` and detecting` electrical oscillations, thc variablecondenser l2, which circuit is and is particularly usclul in receivingand preferably tuned to the wave frequency, and detecting the electricaloscillations used in a circuit comprising the variable condenserwireless telegraphy. This, however, is not ll, variable inductance 10and telephone 9, its only use, since it may be used in connecdetector 6and variable inductance 8 i contion with other apparatus in whichelectrical nccted in parallel, and the secondary of the 7o oscillationsare to be detected as, for inoscillation transformer 5, which ispreterstance, in wire telegraphy or in Wireless or ably tuned to thegroup frequency of the wire telephony. Nor is my invention limitedoscillations received The effect of the secto any particular kind 0lelectrical oscillaondary of the transformer 5 upon the tuning tions,since it may be used to receive and ot the last mentioned circuit ispractically tect a variety of different kinds ci cscillanegligiblebecause the value of the inductions produced in various ways. tance ci"this secondary is very small as com ll shall describe my invention incornice pared to that of the inductances 8 and 10. tion with thereceiving end of a wireless lll'hilo l do not wish to limit myself toany telegraph system in which a circuit tuned particular ratio betweenthe various inducdit to the group frequency of the received oscillationsis used.

llt is well known that in such apparatus, having a circuit tuned to thegroup `irequency of the received oscillations, the' strength of thereceived signals is greatly diminished, and one of the objects of my in!vention is to correct this diminution of the signals, bringing thembacio to approximately the strength that they would` have were thecircuits tunedto wave frequency only.

ln the drawings accompanying my specification I have shown at il anaerial; at 2 an aerial tuning inductance; at 3 the primary of anoscillation transformer; and at l the earth or other suitable capactiy.'While l have shown an inductive coupling he tween the primary andsecondary circuits through the oscillation transformer, this couplingmay be direct or conductive, or static.

The secondary circuit, which. is connected to the secondary ot theoscillation transformer 5, consistsv of two circuits shunted about thesecondary 5, one containing the variable condenser 12 and the othercontaining' the condenser l and the detector in series, a variablecondenser ll, inductance l0 and telephone 9 chanting the condensertanccsn it may be stated that good results are obtain ed by making theinductances 8 and l0 of substantially the same order, and each of themabout i000 times the inductance of the secondary 5.

l cannot state with certainty the theory upon which my improved circuitoperates. lit has occurred to me, however, that the effeet of theimpedance 8 upon the operation Ot' the circuit may be as follows: Thedetector 6, while permitting the passage of impulses in one direction.tends to prevent their passage in the other direction and thusinterferes with the oscillation ot the circuit. By placingl an impedancein shunt with the detector, however, a path is provided for the passageci" oscillations in both directions, thus improving; the operation, ofthe circuit` The impedance 8 being of relatively high value, does not,however, intertere with the operation of the detector in the case ofhigh frequencies.

ln the operation of my improved device, il n'lay proceed as follows:first tune the aerial circuit l, 2, 3, t and the circuit containing theinductance 5 and condenser l2 to the wave frequency of the receivedoscil lations. li then vary. the value out the condenser 'il theinductance il) to tune to group frequency, and, then vary the value ontinductcnce 8 until the maximum response is obtained in the telephone 9.

While I have shown only one form my invention may take, I do not Wish tolimit myself to this particular form, since it is shown merely by Way ofillustration and, as l have pointed out, it may be greatlyvaried'without departing from the spirit of my in# vention.

What l clalm is:

l. lin a.' receiver of electrical oscillations, e.`

secondary circuit including a circuit tuned to the grou 'frequency ofthe received oscile ictions, an conteming a detector and an 1ndiceting`device, in combination With an in-,

' in combination with eny inductancd. 1n shunt with the detector and inseries with the indicatin device.

3A. e receiver of electrical oscillations,

nn open oscillatingcircuit tuned to the wave frequency of the receivedoscillations, and c secondary circuit coupled thereto, and including acircuit tuned to the group frequency of the received oscillntionsfendcontaining a detector and an indicatingkfdevice, 1n combination with aninductance in shunt with the detector and in series Witlnthe indicatingdevice.

4. In u receiver ot' electrical oscillations, un open oscillatingcircuit tuned to the Wave frequency of the received oscillations, and :Lsecondary circuit coupled thereto and including e circuit tuned to theweve fre- .quency of the received oscillations, and containing udetector and an indicating device, in combination with an inductance inshunt with the detector and in series with the indieating device.

n Witness whereof I have hereunto signed my name in the presence of twowitnesses on this 17th day of June, 1914.

ROY A. WEAGANT. Witnesses:

WALTER S. JONES, WM. M. EARL.

